[fio.git] / lib / pattern.c

#include "fio.h"
#include "strntol.h"
#include "pattern.h"

/**
 * parse_string() - parses string in double quotes, like "abc"
 * @beg - string input
 * @out - output buffer where parsed number should be put
 * @out_len - length of the output buffer
 * @filled - pointer where number of bytes successfully
 *           parsed will be put
 *
 * Returns the end pointer where parsing has been stopped.
 * In case of parsing error or lack of bytes in output buffer
 * NULL will be returned.
 */
static const char *parse_string(const char *beg, char *out,
				unsigned int out_len,
				unsigned int *filled)
{
	const char *end;

	if (!out_len)
		return NULL;

	assert(*beg == '"');
	beg++;
	end = strchr(beg, '"');
	if (!end)
		return NULL;
	if (end - beg > out_len)
		return NULL;

	memcpy(out, beg, end - beg);
	*filled = end - beg;

	/* Catch up quote */
	return end + 1;
}

/**
 * parse_number() - parses numbers
 * @beg - string input
 * @out - output buffer where parsed number should be put
 * @out_len - length of the output buffer
 * @filled - pointer where number of bytes successfully
 *           parsed will be put
 *
 * Supports decimals in the range [INT_MIN, INT_MAX] and
 * hexidecimals of any size, which should be started with
 * prefix 0x or 0X.
 *
 * Returns the end pointer where parsing has been stopped.
 * In case of parsing error or lack of bytes in output buffer
 * NULL will be returned.
 */
static const char *parse_number(const char *beg, char *out,
				unsigned int out_len,
				unsigned int *filled)
{
	const char *end;
	unsigned int val;
	long lval;
	int num, i;

	if (!out_len)
		return NULL;

	num = 0;
	sscanf(beg, "0%*[xX]%*[0-9a-fA-F]%n", &num);
	if (num == 0) {
		/* Here we are trying to parse decimal */

		char *_end;

		/* Looking ahead */
		_end = strcasestr(beg, "0x");
		if (_end)
			num = _end - beg;
		if (num)
			lval = strntol(beg, num, &_end, 10);
		else
			lval = strtol(beg, &_end, 10);
		if (beg == _end || lval > INT_MAX || lval < INT_MIN)
			return NULL;
		end = _end;
		i = 0;
		if (!lval) {
			num    = 0;
			out[i] = 0x00;
			i      = 1;
		} else {
			val = (unsigned int)lval;
			for (; val && out_len; out_len--, i++, val >>= 8)
				out[i] = val & 0xff;
			if (val)
				return NULL;
		}
	} else {
		assert(num > 2);

		/* Catch up 0x prefix */
		num -= 2;
		beg += 2;

		/* Look back, handle this combined string: 0xff0x14 */
		if (beg[num] && !strncasecmp(&beg[num - 1], "0x", 2))
			num--;

		end  = beg + num;

		for (i = 0; num && out_len;
		     out_len--, i++, num -= 2, beg += 2) {
			const char *fmt;

			fmt = (num & 1 ? "%1hhx" : "%2hhx");
			sscanf(beg, fmt, &out[i]);
			if (num & 1) {
				num++;
				beg--;
			}
		}
		if (num)
			return NULL;
	}

	*filled = i;
	return end;

}

/**
 * parse_format() - parses formats, like %o, etc
 * @in - string input
 * @out - output buffer where space for format should be reserved
 * @parsed - number of bytes which were already parsed so far
 * @out_len - length of the output buffer
 * @fmt_desc - format descritor array, what we expect to find
 * @fmt_desc_sz - size of the format descritor array
 * @fmt - format array, the output
 * @fmt_sz - size of format array
 *
 * This function tries to find formats, e.g.:
 *   %o - offset of the block
 *
 * In case of successfull parsing it fills the format param
 * with proper offset and the size of the expected value, which
 * should be pasted into buffer using the format 'func' callback.
 *
 * Returns the end pointer where parsing has been stopped.
 * In case of parsing error or lack of bytes in output buffer
 * NULL will be returned.
 */
static const char *parse_format(const char *in, char *out, unsigned int parsed,
				unsigned int out_len, unsigned int *filled,
				const struct pattern_fmt_desc *fmt_desc,
				unsigned int fmt_desc_sz,
				struct pattern_fmt *fmt, unsigned int fmt_sz)
{
	int i;
	struct pattern_fmt *f = NULL;
	unsigned int len = 0;

	if (!out_len || !fmt_desc || !fmt_desc_sz || !fmt || !fmt_sz)
		return NULL;

	assert(*in == '%');

	for (i = 0; i < fmt_desc_sz; i++) {
		const struct pattern_fmt_desc *desc;

		desc = &fmt_desc[i];
		len  = strlen(desc->fmt);
		if (0 == strncmp(in, desc->fmt, len)) {
			fmt->desc = desc;
			fmt->off  = parsed;
			f = fmt;
			break;
		}
	}

	if (!f)
		return NULL;
	if (f->desc->len > out_len)
		return NULL;

	memset(out, '\0', f->desc->len);
	*filled = f->desc->len;

	return in + len;
}

/**
 * parse_and_fill_pattern() - Parses combined input, which consists of strings,
 *                            numbers and pattern formats.
 * @in - string input
 * @in_len - size of the input string
 * @out - output buffer where parsed result will be put
 * @out_len - lengths of the output buffer
 * @fmt_desc - array of pattern format descriptors [input]
 * @fmt_desc_sz - size of the format descriptor array
 * @fmt - array of pattern formats [output]
 * @fmt_sz - pointer where the size of pattern formats array stored [input],
 *           after successfull parsing this pointer will contain the number
 *           of parsed formats if any [output].
 *
 * strings:
 *   bytes sequence in double quotes, e.g. "123".
 *   NOTE: there is no way to escape quote, so "123\"abc" does not work.
 *
 * numbers:
 *   hexidecimal - sequence of hex bytes starting from 0x or 0X prefix,
 *                 e.g. 0xff12ceff1100ff
 *   decimal     - decimal number in range [INT_MIN, INT_MAX]
 *
 * formats:
 *   %o - offset of block, reserved 8 bytes.
 *
 * Explicit examples of combined string:
 * #1                  #2                 #3        #4
 *    in="abcd"          in=-1024           in=66     in=0xFF0X1
 *   out=61 62 63 64    out=00 fc ff ff    out=42    out=ff 01
 *
 * #5                                #6
 *    in=%o                            in="123"0xFFeeCC
 *   out=00 00 00 00 00 00 00 00      out=31 32 33 ff ec cc
 *
 * #7
 *   in=-100xab"1"%o"2"
 *  out=f6 ff ff ff ab 31 00 00 00 00 00 00 00 00 32
 *
 * #9
 *    in=%o0xdeadbeef%o
 *   out=00 00 00 00 00 00 00 00 de ad be ef 00 00 00 00 00 00 00 00
 *
 * #10
 *    in=0xfefefefefefefefefefefefefefefefefefefefefe
 *   out=fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 *
 * Returns number of bytes filled or err < 0 in case of failure.
 */
int parse_and_fill_pattern(const char *in, unsigned int in_len,
			   char *out, unsigned int out_len,
			   const struct pattern_fmt_desc *fmt_desc,
			   unsigned int fmt_desc_sz,
			   struct pattern_fmt *fmt,
			   unsigned int *fmt_sz_out)
{
	const char *beg, *end, *out_beg = out;
	unsigned int total = 0, fmt_rem = 0;

	if (!in || !in_len || !out || !out_len)
		return -EINVAL;
	if (fmt_sz_out)
		fmt_rem = *fmt_sz_out;

	beg = in;
	do {
		unsigned int filled;
		int parsed_fmt;

		filled     = 0;
		parsed_fmt = 0;

		switch (*beg) {
		case '"':
			end = parse_string(beg, out, out_len, &filled);
			break;
		case '%':
			end = parse_format(beg, out, out - out_beg, out_len,
					   &filled, fmt_desc, fmt_desc_sz,
					   fmt, fmt_rem);
			parsed_fmt = 1;
			break;
		default:
			end = parse_number(beg, out, out_len, &filled);
			break;
		}

		if (!end)
			return -EINVAL;

		if (parsed_fmt) {
			assert(fmt_rem);
			fmt_rem--;
			fmt++;
		}

		assert(end - beg <= in_len);
		in_len -= end - beg;
		beg     = end;

		assert(filled);
		assert(filled <= out_len);
		out_len -= filled;
		out     += filled;
		total   += filled;

	} while (in_len);

	if (fmt_sz_out)
		*fmt_sz_out -= fmt_rem;
	return total;
}

/**
 * dup_pattern() - Duplicates part of the pattern all over the buffer.
 *
 * Returns 0 in case of success or errno < 0 in case of failure.
 */
static int dup_pattern(char *out, unsigned int out_len, unsigned int pattern_len)
{
	unsigned int left, len, off;

	if (out_len <= pattern_len)
		/* Normal case */
		return 0;

	off  = pattern_len;
	left = (out_len - off);
	len  = min(left, off);

	/* Duplicate leftover */
	while (left) {
		memcpy(out + off, out, len);
		left -= len;
		off <<= 1;
		len   = min(left, off);
	}

	return 0;
}

/**
 * cpy_pattern() - Copies pattern to the buffer.
 *
 * Function copies pattern along the whole buffer.
 *
 * Returns 0 in case of success or errno < 0 in case of failure.
 */
int cpy_pattern(const char *pattern, unsigned int pattern_len,
		char *out, unsigned int out_len)
{
	unsigned int len;

	if (!pattern || !pattern_len || !out || !out_len)
		return -EINVAL;

	/* Copy pattern */
	len = min(pattern_len, out_len);
	memcpy(out, pattern, len);

	/* Spread filled chunk all over the buffer */
	return dup_pattern(out, out_len, pattern_len);
}

/**
 * cmp_pattern() - Compares pattern and buffer.
 *
 * For the sake of performance this function avoids any loops.
 * Firstly it tries to compare the buffer itself, checking that
 * buffer consists of repeating patterns along the buffer size.
 *
 * If the difference is not found then the function tries to compare
 * buffer and pattern.
 *
 * Returns 0 in case of success or errno < 0 in case of failure.
 */
int cmp_pattern(const char *pattern, unsigned int pattern_size,
		unsigned int off, const char *buf, unsigned int len)
{
	int rc;
	unsigned int size;

	/* Find the difference in buffer */
	if (len > pattern_size) {
		rc = memcmp(buf, buf + pattern_size, len - pattern_size);
		if (rc)
			return -EILSEQ;
	}
	/* Compare second part of the pattern with buffer */
	if (off) {
		size = min(len, pattern_size - off);
		rc = memcmp(buf, pattern + off, size);
		if (rc)
			return -EILSEQ;
		buf += size;
		len -= size;
	}
	/* Compare first part of the pattern or the whole pattern
	 * with buffer */
	if (len) {
		size = min(len, (off ? off : pattern_size));
		rc = memcmp(buf, pattern, size);
		if (rc)
			return -EILSEQ;
	}

	return 0;
}

/**
 * paste_format_inplace() - Pastes parsed formats to the pattern.
 *
 * This function pastes formats to the pattern. If @fmt_sz is 0
 * function does nothing and pattern buffer is left untouched.
 *
 * Returns 0 in case of success or errno < 0 in case of failure.
 */
int paste_format_inplace(char *pattern, unsigned int pattern_len,
			 struct pattern_fmt *fmt, unsigned int fmt_sz,
			 void *priv)
{
	int i, rc;
	unsigned int len;

	if (!pattern || !pattern_len || !fmt)
		return -EINVAL;

	/* Paste formats for first pattern chunk */
	for (i = 0; i < fmt_sz; i++) {
		struct pattern_fmt *f;

		f = &fmt[i];
		if (pattern_len <= f->off)
			break;
		len = min(pattern_len - f->off, f->desc->len);
		rc  = f->desc->paste(pattern + f->off, len, priv);
		if (rc)
			return rc;
	}

	return 0;
}

/**
 * paste_format() - Pastes parsed formats to the buffer.
 *
 * This function copies pattern to the buffer, pastes format
 * into it and then duplicates pattern all over the buffer size.
 *
 * Returns 0 in case of success or errno < 0 in case of failure.
 */
int paste_format(const char *pattern, unsigned int pattern_len,
		 struct pattern_fmt *fmt, unsigned int fmt_sz,
		 char *out, unsigned int out_len, void *priv)
{
	int rc;
	unsigned int len;

	if (!pattern || !pattern_len || !out || !out_len)
		return -EINVAL;

	/* Copy pattern */
	len = min(pattern_len, out_len);
	memcpy(out, pattern, len);

	rc = paste_format_inplace(out, len, fmt, fmt_sz, priv);
	if (rc)
		return rc;

	/* Spread filled chunk all over the buffer */
	return dup_pattern(out, out_len, pattern_len);
}
Commit	Line	Data
634bd210 RP	1	#include "fio.h"
	2	#include "strntol.h"
	3	#include "pattern.h"
	4
	5	/**
	6	* parse_string() - parses string in double quotes, like "abc"
	7	* @beg - string input
	8	* @out - output buffer where parsed number should be put
	9	* @out_len - length of the output buffer
	10	* @filled - pointer where number of bytes successfully
	11	* parsed will be put
	12	*
	13	* Returns the end pointer where parsing has been stopped.
	14	* In case of parsing error or lack of bytes in output buffer
	15	* NULL will be returned.
	16	*/
	17	static const char parse_string(const char beg, char *out,
	18	unsigned int out_len,
	19	unsigned int *filled)
	20	{
	21	const char *end;
	22
	23	if (!out_len)
	24	return NULL;
	25
	26	assert(*beg == '"');
	27	beg++;
	28	end = strchr(beg, '"');
	29	if (!end)
	30	return NULL;
	31	if (end - beg > out_len)
	32	return NULL;
	33
	34	memcpy(out, beg, end - beg);
	35	*filled = end - beg;
	36
	37	/* Catch up quote */
	38	return end + 1;
	39	}
	40
	41	/**
	42	* parse_number() - parses numbers
	43	* @beg - string input
	44	* @out - output buffer where parsed number should be put
	45	* @out_len - length of the output buffer
	46	* @filled - pointer where number of bytes successfully
	47	* parsed will be put
	48	*
	49	* Supports decimals in the range [INT_MIN, INT_MAX] and
	50	* hexidecimals of any size, which should be started with
	51	* prefix 0x or 0X.
	52	*
	53	* Returns the end pointer where parsing has been stopped.
	54	* In case of parsing error or lack of bytes in output buffer
	55	* NULL will be returned.
	56	*/
	57	static const char parse_number(const char beg, char *out,
	58	unsigned int out_len,
	59	unsigned int *filled)
	60	{
	61	const char *end;
	62	unsigned int val;
	63	long lval;
	64	int num, i;
65
66	if (!out_len)
67	return NULL;
68
69	num = 0;
70	sscanf(beg, "0%[xX]%[0-9a-fA-F]%n", &num);
71	if (num == 0) {
72	/* Here we are trying to parse decimal */
73
74	char *_end;
75
76	/* Looking ahead */
77	_end = strcasestr(beg, "0x");
78	if (_end)
79	num = _end - beg;
80	if (num)
81	lval = strntol(beg, num, &_end, 10);
82	else
83	lval = strtol(beg, &_end, 10);
84	if (beg == _end \|\| lval > INT_MAX \|\| lval < INT_MIN)
85	return NULL;
86	end = _end;
87	i = 0;
88	if (!lval) {
89	num = 0;
90	out[i] = 0x00;
91	i = 1;
92	} else {
93	val = (unsigned int)lval;
94	for (; val && out_len; out_len--, i++, val >>= 8)
95	out[i] = val & 0xff;
96	if (val)
97	return NULL;
98	}
99	} else {
100	assert(num > 2);
101
102	/* Catch up 0x prefix */
103	num -= 2;
104	beg += 2;
105
106	/* Look back, handle this combined string: 0xff0x14 */
107	if (beg[num] && !strncasecmp(&beg[num - 1], "0x", 2))
108	num--;
109
110	end = beg + num;
111
112	for (i = 0; num && out_len;
113	out_len--, i++, num -= 2, beg += 2) {
114	const char *fmt;
115
116	fmt = (num & 1 ? "%1hhx" : "%2hhx");
117	sscanf(beg, fmt, &out[i]);
118	if (num & 1) {
119	num++;
120	beg--;
121	}
122	}
123	if (num)
124	return NULL;
125	}
126
127	*filled = i;
128	return end;
129
130	}
131
132	/**
133	* parse_format() - parses formats, like %o, etc
134	* @in - string input
135	* @out - output buffer where space for format should be reserved
136	* @parsed - number of bytes which were already parsed so far
137	* @out_len - length of the output buffer
138	* @fmt_desc - format descritor array, what we expect to find
139	* @fmt_desc_sz - size of the format descritor array
140	* @fmt - format array, the output
141	* @fmt_sz - size of format array
142	*
143	* This function tries to find formats, e.g.:
144	* %o - offset of the block
145	*
146	* In case of successfull parsing it fills the format param
147	* with proper offset and the size of the expected value, which
148	* should be pasted into buffer using the format 'func' callback.
149	*
150	* Returns the end pointer where parsing has been stopped.
151	* In case of parsing error or lack of bytes in output buffer
152	* NULL will be returned.
153	*/
154	static const char parse_format(const char in, char *out, unsigned int parsed,
155	unsigned int out_len, unsigned int *filled,
156	const struct pattern_fmt_desc *fmt_desc,
157	unsigned int fmt_desc_sz,
158	struct pattern_fmt *fmt, unsigned int fmt_sz)
159	{
160	int i;
161	struct pattern_fmt *f = NULL;
162	unsigned int len = 0;
163
164	if (!out_len \|\| !fmt_desc \|\| !fmt_desc_sz \|\| !fmt \|\| !fmt_sz)
165	return NULL;
166
167	assert(*in == '%');
168
169	for (i = 0; i < fmt_desc_sz; i++) {
170	const struct pattern_fmt_desc *desc;
171
172	desc = &fmt_desc[i];
173	len = strlen(desc->fmt);
174	if (0 == strncmp(in, desc->fmt, len)) {
175	fmt->desc = desc;
176	fmt->off = parsed;
177	f = fmt;
178	break;
179	}
180	}
181
182	if (!f)
183	return NULL;
184	if (f->desc->len > out_len)
185	return NULL;
186
187	memset(out, '\0', f->desc->len);
188	*filled = f->desc->len;
189
190	return in + len;
191	}
192
193	/**
194	* parse_and_fill_pattern() - Parses combined input, which consists of strings,
195	* numbers and pattern formats.
196	* @in - string input
197	* @in_len - size of the input string
198	* @out - output buffer where parsed result will be put
199	* @out_len - lengths of the output buffer
200	* @fmt_desc - array of pattern format descriptors [input]
201	* @fmt_desc_sz - size of the format descriptor array
202	* @fmt - array of pattern formats [output]
203	* @fmt_sz - pointer where the size of pattern formats array stored [input],
204	* after successfull parsing this pointer will contain the number
205	* of parsed formats if any [output].
206	*
207	* strings:
208	* bytes sequence in double quotes, e.g. "123".
209	* NOTE: there is no way to escape quote, so "123\"abc" does not work.
210	*
211	* numbers:
212	* hexidecimal - sequence of hex bytes starting from 0x or 0X prefix,
213	* e.g. 0xff12ceff1100ff
214	* decimal - decimal number in range [INT_MIN, INT_MAX]
215	*
216	* formats:
217	* %o - offset of block, reserved 8 bytes.
218	*
219	* Explicit examples of combined string:
220	* #1 #2 #3 #4
221	* in="abcd" in=-1024 in=66 in=0xFF0X1
222	* out=61 62 63 64 out=00 fc ff ff out=42 out=ff 01
223	*
224	* #5 #6
225	* in=%o in="123"0xFFeeCC
226	* out=00 00 00 00 00 00 00 00 out=31 32 33 ff ec cc
227	*
228	* #7
229	* in=-100xab"1"%o"2"
230	* out=f6 ff ff ff ab 31 00 00 00 00 00 00 00 00 32
231	*
232	* #9
233	* in=%o0xdeadbeef%o
234	* out=00 00 00 00 00 00 00 00 de ad be ef 00 00 00 00 00 00 00 00
235	*
236	* #10
237	* in=0xfefefefefefefefefefefefefefefefefefefefefe
238	* out=fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
239	*
240	* Returns number of bytes filled or err < 0 in case of failure.
241	*/
242	int parse_and_fill_pattern(const char *in, unsigned int in_len,
243	char *out, unsigned int out_len,
244	const struct pattern_fmt_desc *fmt_desc,
245	unsigned int fmt_desc_sz,
246	struct pattern_fmt *fmt,
247	unsigned int *fmt_sz_out)
248	{
249	const char beg, end, *out_beg = out;
250	unsigned int total = 0, fmt_rem = 0;
251
252	if (!in \|\| !in_len \|\| !out \|\| !out_len)
253	return -EINVAL;
254	if (fmt_sz_out)
255	fmt_rem = *fmt_sz_out;
256
257	beg = in;
258	do {
259	unsigned int filled;
260	int parsed_fmt;
261
262	filled = 0;
263	parsed_fmt = 0;
264
265	switch (*beg) {
266	case '"':
267	end = parse_string(beg, out, out_len, &filled);
268	break;
269	case '%':
270	end = parse_format(beg, out, out - out_beg, out_len,
271	&filled, fmt_desc, fmt_desc_sz,
272	fmt, fmt_rem);
273	parsed_fmt = 1;
274	break;
275	default:
276	end = parse_number(beg, out, out_len, &filled);
277	break;
278	}
279
280	if (!end)
281	return -EINVAL;
282
283	if (parsed_fmt) {
284	assert(fmt_rem);
285	fmt_rem--;
286	fmt++;
287	}
288
289	assert(end - beg <= in_len);
290	in_len -= end - beg;
291	beg = end;
292
293	assert(filled);
294	assert(filled <= out_len);
295	out_len -= filled;
296	out += filled;
297	total += filled;
298
299	} while (in_len);
300
301	if (fmt_sz_out)
302	*fmt_sz_out -= fmt_rem;
303	return total;
304	}
305
306	/**
307	* dup_pattern() - Duplicates part of the pattern all over the buffer.
308	*
309	* Returns 0 in case of success or errno < 0 in case of failure.
310	*/
311	static int dup_pattern(char *out, unsigned int out_len, unsigned int pattern_len)
312	{
313	unsigned int left, len, off;
314
315	if (out_len <= pattern_len)
316	/* Normal case */
317	return 0;
318
319	off = pattern_len;
320	left = (out_len - off);
321	len = min(left, off);
322
323	/* Duplicate leftover */
324	while (left) {
325	memcpy(out + off, out, len);
326	left -= len;
327	off <<= 1;
328	len = min(left, off);
329	}
330
331	return 0;
332	}
333
334	/**
335	* cpy_pattern() - Copies pattern to the buffer.
336	*
337	* Function copies pattern along the whole buffer.
338	*
339	* Returns 0 in case of success or errno < 0 in case of failure.
340	*/
341	int cpy_pattern(const char *pattern, unsigned int pattern_len,
342	char *out, unsigned int out_len)
343	{
344	unsigned int len;
345
346	if (!pattern \|\| !pattern_len \|\| !out \|\| !out_len)
347	return -EINVAL;
348
349	/* Copy pattern */
350	len = min(pattern_len, out_len);
351	memcpy(out, pattern, len);
352
353	/* Spread filled chunk all over the buffer */
354	return dup_pattern(out, out_len, pattern_len);
355	}
356
357	/**
358	* cmp_pattern() - Compares pattern and buffer.
359	*
360	* For the sake of performance this function avoids any loops.
361	* Firstly it tries to compare the buffer itself, checking that
362	* buffer consists of repeating patterns along the buffer size.
363	*
364	* If the difference is not found then the function tries to compare
365	* buffer and pattern.
366	*
367	* Returns 0 in case of success or errno < 0 in case of failure.
368	*/
369	int cmp_pattern(const char *pattern, unsigned int pattern_size,
370	unsigned int off, const char *buf, unsigned int len)
371	{
372	int rc;
373	unsigned int size;
374
375	/* Find the difference in buffer */
376	if (len > pattern_size) {
377	rc = memcmp(buf, buf + pattern_size, len - pattern_size);
378	if (rc)
379	return -EILSEQ;
380	}
381	/* Compare second part of the pattern with buffer */
382	if (off) {
383	size = min(len, pattern_size - off);
384	rc = memcmp(buf, pattern + off, size);
385	if (rc)
386	return -EILSEQ;
387	buf += size;
388	len -= size;
389	}
390	/* Compare first part of the pattern or the whole pattern
391	* with buffer */
392	if (len) {
393	size = min(len, (off ? off : pattern_size));
394	rc = memcmp(buf, pattern, size);
395	if (rc)
396	return -EILSEQ;
397	}
398
399	return 0;
400	}
401
402	/**
403	* paste_format_inplace() - Pastes parsed formats to the pattern.
404	*
405	* This function pastes formats to the pattern. If @fmt_sz is 0
406	* function does nothing and pattern buffer is left untouched.
407	*
408	* Returns 0 in case of success or errno < 0 in case of failure.
409	*/
410	int paste_format_inplace(char *pattern, unsigned int pattern_len,
411	struct pattern_fmt *fmt, unsigned int fmt_sz,
412	void *priv)
413	{
414	int i, rc;
415	unsigned int len;
416
417	if (!pattern \|\| !pattern_len \|\| !fmt)
418	return -EINVAL;
419
420	/* Paste formats for first pattern chunk */
421	for (i = 0; i < fmt_sz; i++) {
422	struct pattern_fmt *f;
423
424	f = &fmt[i];
425	if (pattern_len <= f->off)
426	break;
427	len = min(pattern_len - f->off, f->desc->len);
428	rc = f->desc->paste(pattern + f->off, len, priv);
429	if (rc)
430	return rc;
431	}
432
433	return 0;
434	}
435
436	/**
437	* paste_format() - Pastes parsed formats to the buffer.
438	*
439	* This function copies pattern to the buffer, pastes format
440	* into it and then duplicates pattern all over the buffer size.
441	*
442	* Returns 0 in case of success or errno < 0 in case of failure.
443	*/
444	int paste_format(const char *pattern, unsigned int pattern_len,
445	struct pattern_fmt *fmt, unsigned int fmt_sz,
446	char out, unsigned int out_len, void priv)
447	{
448	int rc;
449	unsigned int len;
450
451	if (!pattern \|\| !pattern_len \|\| !out \|\| !out_len)
452	return -EINVAL;
453
454	/* Copy pattern */
455	len = min(pattern_len, out_len);
456	memcpy(out, pattern, len);
457
458	rc = paste_format_inplace(out, len, fmt, fmt_sz, priv);
459	if (rc)
460	return rc;
461
462	/* Spread filled chunk all over the buffer */
463	return dup_pattern(out, out_len, pattern_len);
464	}